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Conclusions and Remarks
C1.1 Using equations (2), (3), and (5), and any two points from Table E1.4,
calculate and of the machine, for = 120 and = 250 ; for better
accuracy, the two points should be the extremes, i.e., one from the top and the
other from t

PROBLEMS
th
ns
er
ir
167
(a) Determine the resistance and inductance of the field circuit, the
armature circuit resistance, and the constant k.
(b) Write three equations relating the instantaneous values of the six ter
minal variables of this machine: the

PROBLEMS
th
ns
er
ir
167
(a) Determine the resistance and inductance of the field circuit, the
armature circuit resistance, and the constant k.
(b) Write three equations relating the instantaneous values of the six ter
minal variables of this machine: the

3'54 lChapter 15 Magnetic Circuits and Transformers
ﬁelds on the positive and negative part of
each axis, assuming that 11 and I]. are both
positive. b. Compute the torque on the wire
that lies on the y axis.
Section 15.2: i'tlrlgltctit‘ t'ircuits
*P1524.

76
CHAPTER 2
TRANSFORMERS
PROBLEMS
(2.) Consider the transformer shown in Fig. 2.12.
(a) Place polarity dots on windings 3 and 4.
(b) State the number of turns of winding 4.
(Section 2.1)
A two-winding transformer has 200 turns on its primary windin
g and

76
CHAPTER 2
TRANSFORMERS
PROBLEMS
(2.) Consider the transformer shown in Fig. 2.12.
(a) Place polarity dots on windings 3 and 4.
(b) State the number of turns of winding 4.
(Section 2.1)
A two-winding transformer has 200 turns on its primary windin
g and

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